update = new Button("Update");
update.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
MainComponent.updateComponents();
System.out.println(updated.isVisible());
updated.setVisible(true);
System.out.println(updated.isVisible());
}
});
When I press the button I get the following output in console:
false
true
If I start with setVisible(true) and use updated.setVisible(!updated.isVisible()) it works fine. Why can't I start with it hidden??
I tried to use updated.revalidate() after setting it visible. That made it work but it makes the whole UI flicker when pushing the button which isnt desired.
I'm doing a software Java GUI - JFrame form like this:
1. The user wants to click on a button that opens a bunch of images that will be displayed as thumbnail in the bottom of the JFrame . 2. Then the user wants to select/click one of the thumbnail and make appear the corresponding image in it's original size on above(center) of the JFrame.
For doing this I used 3 JPanel.
One contains a JButton that opens the jfilechoser dialog window, the second "panelPreview" is for putting the thumbnails created, and the third "panelGrande" is for the image in it's original size.
The firs part "1." is ok.
But in the second part : I got one error when I want to put the ImageIcon in to the JLabel with the further intent of displaying it.
lblBig(imgIcoVett[i]);
In this project I'm dealing with arrays of ImageIcons and JLabels, so it's a bit advanced level for me, so I'm not sure that I wrote right the part of the MouseListener too.
The error displayed by netbeans says "cannot find symbol symbol: method lbl (ImageIcon) local variables referenced from an inner class must be final or effectively final"
Here I attach the project I did with netbeans"AAAD Unlayout 2.zip", but if you just need the highlight of the code, here it is too:
I need a code to get a text from a textField to a label but the label is on a different frame, i will give u an example of what i have so far. so this is the main:
package albaestate; public class AlbaEstate { public static void main(String[] args) { Frame1 first = new Frame1(); first.setVisible(true); }
/*[B]now i have the first frame where i input the information[/B]*/
package albaestate; public class Frame1 extends javax.swing.JFrame { public Frame1() { initComponents();
[Code] ....
What i need is to input the code so that in jLabel5 i get the text from jTextField1 in Frame1; in jLabel6 i need the text from jTextField2 also in Frame1; and in jLabel7 i want to display the calculation of what the jbutton1 in Frame1 is calculating.
I just went through some multiple choice questions and found this question with the below choices,
a) It is not standardized b) To avoid conflicts since assemblers and loaders use such names c) To avoid conflicts since library routines use such names d) To avoid conflicts with environment variables of an operating system
Now , what should be the explanation for answering such question.
I want to find a certain element in array I have to scan through the array index starting from 0 until I find the number I am looking for. Even in data structures which use hashing like HashMap and Hashtable we will have to scan through the keys until we find the key we are looking for. So what is the use of hashing over index based searching? I mean how is hashing an advantage over an array?
Here i want to print the String from Starting character which is given by user..Here i given below the image like my concept..here we put .(dot and enter R)eclipse will print the method name which is starting from R..
I need to modify the drawShape method to calculate the distance from the starting point (the diameter) of any shape regardless of how many sides I give it, but I have absolutely no clue where to begin with this. The ultimate goal of the program is to calculate the value of pi using the shape that is drawn.
Here is the code:
public class PiTurtle extends Turtle { private double mySize; private int mySides; private double diameter = 0; final static double startX = 590.0; final double startY; public PiTurtle(int nSides)
I need to modify the drawShape method to calculate the distance from the starting point (the diameter) of any shape regardless of how many sides I give it, but I have absolutely no clue where to begin with this. The ultimate goal of the program is to calculate the value of pi using the shape that is drawn.
Java Code:
public class PiTurtle extends Turtle { private double mySize; private int mySides; private double diameter = 0;
I am working on a simple app that should emulate a desktop with some icons that you can drag around. I was instructed to use the MouseListener and MouseMotionListener. The icons should drag starting at the point where the mouse originally clicked down on it (ie not dragging from the top right corner).
I am drawing my icons to a jpanel, and I seem to be having two problems:The hitboxes are offThe icon is being dragged from the top right corner, despite having setup up a mouse offset at the beginning of the drag..Here are the relevant classes, the Desktop.draw() method is being called from my DrawPanel
import java.awt.*; import javax.swing.*; import java.awt.event.*; public class Desktop implements MouseListener, MouseMotionListener{ static DesktopIcon[] icons;
The problem is it is returning -2, and also returning false when it should be true. There is no error it just is not working correctly.
import java.util.Arrays; import java.util.Scanner; /** * This Script will allow you to add e-Mails and than beable to search for them. */ public class eMailSeacher { public static void main(String[] args)
[Code] ....
1. Enter an Email 2. Find an existing email 3. Exit 1 Enter the users E-Mail: josh -1 Insertion successful.
I have the code and it works very well, but my professor wants us to use Junit testing to test our code. I've never used JUnit before, how it works. Is it possible to have a boolean value (true or false) randomly set?
Here is the code I need to test:
package musicalinstruments; class MusicalInstrument { public String name; public boolean isPlaying; public boolean isTuned; public MusicalInstrument(){ isPlaying = false; isTuned = false;
Create an application that generates a quiz. Prompt for the user's first and last name, college major, and confidence in test taking (high, medium, or low). The quiz should contain at least five true/false questions about horticulture. When the user selects the correct answer, a message of positive reinforcement should be displayed. If the user selects the incorrect answer, the correct answer should be displayed with a message of constructive criticism. At the end of the quiz, display the number of correct and incorrect answers as well as the percentage of correct responses for each user.
import java.util.Scanner; class HorticultureQuiz { public static void main(String[] args){
What is exact difference between them? Another thing is when I check (a==b) it retuns me false, but when I check a.equals(b) it returns me with true. Why So?
I'm supposed to take this truth table and alter it so it displays 1's and 0's instead of true false. I'm assumed to do this I would just need to change the variable type and replace true and false with 1 and 0 but every way I try this does not work.
//a truth table for the logical operators.
class LogicalOpTable { public static void main(String args[]) { boolean p, q; System.out.println("P Q AND OR XOR NOT"); p = true; q = true; System.out.print(p + " " + q +" ");
This method pretty much determines if there is a path from one vertex to another. When I check to see if there is a path from 5 to 2 (which there is) it return false. However, when I create a driver method, it return true (which it should). Why? It should never reach outside of the else because the condition is met, right???
Path: 5 points to 1 and 3 (1 does not have a path to anything). 3 points to only 0. 0 points to 1 and 2. Thus there is a path from 5 to 2.
Here is the code without the driver (the one that is returning false, even tho it should be true)
public boolean existsPath(int x, int y){//x = 5, y = 2 stack.push(x);//mark x as visited if(x == y){//path found stack.removeAllElements(); return true;
My isEmpty method only returns false. Is something wrong? I printed the empty and not empty for testing purposes.
//determines if there are any items in the queue public boolean isEmpty() { if (front == -1 && rear == -1) { System.out.println("empty"); return true; } else { System.out.println("not empty"); return false } }
Why isn't heig ever equal to heightShipArray[count] no matter what letter I type in
String[] heightShipArray = {"A", "a", "B", "b", "C", "c", "D", "d", "E", "e", "F", "f", "G", "g", "H", "h", "I", "i", "J", "j"}; boolean trueHeight = true; // checks if height is a letter between a-j/A-J do { Terminal.printLine("Input height with letters A to J");
I wrote a simple enum and a test class. The enum represents us coins and my test class uses the enum to calculate the change with the least number of coins. For example, I pass in 95 cents, I get back 3 quarters, 2 dimes. It all works just fine, easy to implement and I see why I should use an enum. Then I thought, what if the person is out of dimes. How could I tell the enum to skip dimes in it's switch statements? How would I make DIME(10) false?
I'm trying to create a program that has two labels... one in the top left and one in the top right... so far when i run it only the one in the top right (label2) shows... also In the program there will be multiple button and when I click a button it will show a different panel and then i can go back to the first panel to select other panels... so far i haven't figured out how to make panels visibility go false/true with actionlistener. last thing... when i have more then one panel added to the frame none of them show up.
Java Code:
//Matthew import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Test{ public static void main(String[] args){
import java.util.Scanner; public class AdditionQuiz { public static void main (String[] args){
//Generate random two integers using utility System.currentTimeMillis int n1 = (int)(System.currentTimeMillis() % 10); int n2 = (int)(System.currentTimeMillis() / 7 % 10);
[Code] ....
however the true/false result can not be printed due to the "answer" variable...
